Letter express the application of PLC in the central air conditioning

As in the original system more piece of SDC control instrument malfunction, PLC controller in the maintenance of the original system for replacement. The original control system to complete the indoor temperature, humidity, clean room inside and outside differential pressure testing and control. Indoor air required for level 100. After filtered air become clean air, to meet the requirements of the production line of air cleanliness, temperature and humidity. System working principle of the new fan blowing air through heat exchanger, cooling exchanger, humidifier, entered the room. Room with temperature, humidity, differential pressure detector signal feedback to the controller. By the feedback signal by digital controller to control the heating, cooling, the switch control indoor temperature. When humidity is low, the steam humidifier output; High humidity, cooling exchanger to cool to make the air temperature is reduced, achieve dehumidification. The original humidity, high temperature signal pass processing. When high temperature signal, temperature control is preferred; When the humidity signal is high, the humidity control priority. The original instrument debugging is multifarious, debugging is not easy to meet the requirements. The control signals of the heating, refrigeration, humidifier is 4 20 ma signal. Pressure system is controlled by frequency converter. This modification is not involved. Retrofit scheme of temperature, humidity signal transmitter is sending out DC 4 - The signal of 20 ma. Input signal through comparative judgment, when the temperature of the input signal is less than 12 ma, heating to perform logic, when more than 12 ma, refrigeration logic to be executed. When the humidity of input signal is less than 12 ma, to perform humidification logic, when more than 12 ma, to perform dehumidification logic. And in cooling and dehumidification signal should choose to control cooling exchanger. Due to the PLC controller have good logical judgment ability and data processing ability, transformation of chose letter jie FC series PLC. FC series is modular structure, can according to demand of different simulation module and digital module. Because it is transform, we use the digital quantity few, only used as fault alarm. FC- 16 r - E CPU has eight input/output at 8 o 'clock. According to our needs and configure the FC - 4 AD and FC - analog input module 4 da analog output module. Use effect due to the PLC programming is simple, easy debugging, the whole day to complete. After a period of time running, control effect is very ideal, fully satisfy the system requirements. Is easier to maintain than before.
Shenzhen Coolmay Technology Co., Ltd. is a company that offers a wide selection of . OEM and ODM services are also available to users. To know more, go to Coolmay PLC.
Review Shenzhen Coolmay Technology Co., Ltd. 's progress at regular intervals, so we can continue with the strategies that work well and change or eliminate the ones that don't give the results we are looking for.
plc controller price plc manufacturers with programmable control systems are used extensively in plc controller price.
Shenzhen Coolmay Technology Co., Ltd. are trained to think about problems and coming up with solutions, as well as presenting the whole idea in a logical and coherent manner.